作者：
Abelev, B. I.;Aggarwal, M. M.;Ahammed, Z.;Alakhverdyants, A. V.;Alekseev, I.;...
期刊：
PHYSICAL REVIEW C,2010年81(4) ISSN：2469-9985
通讯作者：
Shi, S. S.
作者机构：
[Iordanova, A.; Hofman, D. J.; Suarez, M. C.; Abelev, B. I.; Evdokimov, O.; Hollis, R. S.; Kauder, K.; Garcia-Solis, E. J.; Betts, R. R.] Univ Illinois, Chicago, IL 60607 USA.;[Li, Z.; Wu, Y.; Liu, F.; Li, N.; Chen, J. Y.; Shi, S. S.] CCNU HZNU, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Underwood, D. G.; Krueger, K.; Bridgeman, A.; Spinka, H. M.] Argonne Natl Lab, Argonne, IL 60439 USA.;[Elhalhuli, E.; Nelson, J. M.; Barnby, L. S.] Univ Birmingham, Birmingham, W Midlands, England.;[Pile, P.; Xu, Z.; Ogawa, A.; Ruan, L.; Tang, A. H.; Fine, V.; Fisyak, Y.; Beavis, D. R.; Sorensen, P.; Christie, W.; Lebedev, A.; Perevoztchikov, V.; Gordon, A.; Landgraf, J. M.; DePhillips, M.; Yip, K.; Didenko, L.; Guryn, W.; Van Buren, G.; Fachini, P.; Ullrich, T.; Lamont, M. A. C.; LeVine, M. J.; Ljubicic, T.; Videbaek, F.; Lauret, J.; Bland, L. C.; Okada, H.; Longacre, R. S.; Webb, J. C.; Arkhipkin, D.; Debbe, R. R.; Burton, T. P.; Dunlop, J. C.; Love, W. A.; Lee, J. H.] Brookhaven Natl Lab, Upton, NY 11973 USA.
通讯机构：
[Shi, S. S.] C;CCNU HZNU, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
We present the results of an elliptic flow, v(2), analysis of Cu + Cu collisions recorded with the solenoidal tracker detector (STAR) at the BNL Relativistic Heavy Ion Collider at root s(NN) = 62.4 and 200 GeV. Elliptic flow as a function of transverse momentum, v(2)(p(T)), is reported for different collision centralities for charged hadrons h(+/-) and strangeness-ontaining hadrons K-S(0), Lambda, Xi, and phi in the midrapidity region vertical bar eta vertical bar < 1.0. Significant reduction in systematic uncertainty of the measurement due to nonflow effects has been achieved by correlating particles at midrapidity, vertical bar eta vertical bar < 1.0, with those at forward rapidity, 2.5 < vertical bar eta vertical bar < 4.0. We also present azimuthal correlations in p + p collisions at root s = 200 GeV to help in estimating nonflow effects. To study the system-size dependence of elliptic flow, we present a detailed comparison with previously published results from Au + Au collisions at root s(NN) = 200 GeV. We observe that v(2)(p(T)) of strange hadrons has similar scaling properties as were first observed in Au + Au collisions, that is, (i) at low transverse momenta, p(T) < 2 GeV/c, v(2) scales with transverse kinetic energy, m(T) - m, and (ii) at intermediate p(T), 2 < p(T) < 4 GeV/c, it scales with the number of constituent quarks, n(q.) We have found that ideal hydrodynamic calculations fail to reproduce the centrality dependence of v(2)(p(T)) for K-S(0) and Lambda. Eccentricity scaled v(2) values, v(2)/epsilon, are larger in more central collisions, suggesting stronger collective flow develops in more central collisions. The comparison with Au + Au collisions, which go further in density, shows that v(2)/epsilon depends on the system size, that is, the number of participants N-part. This indicates that the ideal hydrodynamic limit is not reached in Cu + Cu collisions, presumably because the assumption of thermalization is not attained.
作者：
Abelev, B. I.*;Aggarwal, M. M.;Ahammed, Z.;Alakhverdyants, A. V.;Anderson, B. D.;...
期刊：
PHYSICAL REVIEW C,2010年81(4) ISSN：2469-9985
通讯作者：
Abelev, B. I.
作者机构：
[Iordanova, A.; Hofman, D. J.; Suarez, M. C.; Abelev, B. I.; Evdokimov, O.; Hollis, R. S.; Kauder, K.; Garcia-Solis, E. J.; Betts, R. R.] Univ Illinois, Chicago, IL 60607 USA.;[Underwood, D. G.; Krueger, K.; Bridgeman, A.; Spinka, H. M.] Argonne Natl Lab, Argonne, IL 60439 USA.;[Jones, P. G.; Elhalhuli, E.; Burton, T. P.; Nelson, J. M.; Barnby, L. S.] Univ Birmingham, Birmingham, W Midlands, England.;[Pile, P.; Xu, Z.; Ogawa, A.; Ruan, L.; Tang, A. H.; Fine, V.; Fisyak, Y.; Beavis, D. R.; Sorensen, P.; Christie, W.; Lebedev, A.; Perevoztchikov, V.; Gordon, A.; Landgraf, J. M.; DePhillips, M.; Yip, K.; Didenko, L.; Guryn, W.; Van Buren, G.; Fachini, P.; Ullrich, T.; Lamont, M. A. C.; LeVine, M. J.; Ljubicic, T.; Hallman, T. J.; Videbaek, F.; Lauret, J.; Bland, L. C.; Chung, S. U.; Okada, H.; Longacre, R. S.; Webb, J. C.; Arkhipkin, D.; Debbe, R. R.; Dunlop, J. C.; Love, W. A.; Lee, J. H.] Brookhaven Natl Lab, Upton, NY 11973 USA.;[Perkins, C.; Engelage, J.; Judd, E. G.; Ng, M. J.; Crawford, H. J.] Univ Calif Berkeley, Berkeley, CA 94720 USA.
通讯机构：
[Abelev, B. I.] U;Univ Illinois, Chicago, IL 60607 USA.
摘要：
We present a measurement of pi(+)pi(-)pi(+)pi(-) photonuclear production in ultraperipheral Au-Au collisions at root s(NN) = 200 GeV from the STAR experiment. The pi(+)pi(-)pi(+)pi(-) final states are observed at low transverse momentum and are accompanied by mutual nuclear excitation of the beam particles. The strong enhancement of the production cross section at low transverse momentum is consistent with coherent photoproduction. The pi(+)pi(-)pi(+)pi(-) invariant mass spectrum of the coherent events exhibits a broad peak around 1540 +/- 40 MeV/c(2) with a width of 570 +/- 60 MeV/c(2), in agreement with the photoproduction data for the rho(0)(1700). We do not observe a corresponding peak in the pi(+)pi(-) final state and measure an upper limit for the ratio of the branching fractions of the rho(0)(1700) to pi(+)pi(-) and pi(+)pi(-)pi(+)pi(-) of 2.5% at 90% confidence level. The ratio of rho(0)(1700) and rho(0)(770) coherent production cross sections is measured to be 13.4 +/- 0.8(stat.) +/- 4.4(syst.)%.
摘要：
Background: Previous studies have indicated that the cognitive deficits in patients with Alzheimer's disease (AD) may be due to topological deteriorations of the brain network. However, whether the selection of a specific frequency band could impact the topological properties is still not clear. Our hypothesis is that the topological properties of AD patients are also frequency-specific. Methods: Resting state functional magnetic resonance imaging data from 10 right-handed moderate AD patients (mean age: 64.3 years; mean mini mental state examination [MMSE]: 18.0) and 10 age and gender-matched healthy controls (mean age: 63.6 years; mean MMSE: 28.2) were enrolled in this study. The global efficiency, the clustering coefficient (CC), the characteristic path length (CpL), and "small-world" property were calculated in a wide range of thresholds and averaged within each group, at three different frequency bands (0.01-0.06 Hz, 0.06-0.11 Hz, and 0.11-0.25 Hz). Results: At lower-frequency bands (0.01-0.06 Hz, 0.06-0.11 Hz), the global efficiency, the CC and the "small-world" properties of AD patients decreased compared to controls. While at higher-frequency bands (0.11-0.25 Hz), the CpL was much longer, and the "small-world" property was disrupted in AD, particularly at a higher threshold. The topological properties changed with different frequency bands, suggesting the existence of disrupted global and local functional organization associated with AD. Conclusions: This study demonstrates that the topological alterations of large-scale functional brain networks in AD patients are frequency dependent, thus providing fundamental support for optimal frequency selection in future related research.
作者机构：
[Guo Long; Cai Xu; Deng Wei-Bing; Li Wei] Cent China Normal Univ, Inst Particle Phys, Complex Sci Ctr, Wuhan 430079, Peoples R China.
通讯机构：
[Deng Wei-Bing] C;Cent China Normal Univ, Inst Particle Phys, Complex Sci Ctr, Wuhan 430079, Peoples R China.
关键词：
No English Keyword
摘要：
Through empirical analysis of the global structure of the Worldwide Marine Transportation Network (WMTN), we find that the WMTN, a small-world network, exhibits an exponential-like degree distribution. We hereby investigate the efficiency of the WMTN by employing a simple definition. Compared with many other trans-portation networks, the WMTN possesses relatively low efficiency, Furthermore, by exploring the relationship between the topological structure and the container throughput, we find that strong correlations exist among the container throughout the degree and the clustering coefficient. Also, considering the navigational process that a ship travels in a real shipping line, we obtain that the weight of a seaport is proportional to the total probability contributed by all the passing shipping lines.
作者：
Abelev, B. I.*;Aggarwal, M. M.;Ahammed, Z.;Alakhverdyants, A. V.;Anderson, B. D.;...
期刊：
PHYSICAL REVIEW D,2009年80(11) ISSN：2470-0010
通讯作者：
Abelev, B. I.
作者机构：
[Iordanova, A.; Abelev, B. I.; Barannikova, O.; Hollis, R. S.; Kauder, K.; Garcia-Solis, E. J.; Hofman, D. J.; Betts, R. R.; Suarez, M. C.] Univ Illinois, Chicago, IL 60607 USA.;[Underwood, D. G.; Krueger, K.; Bridgeman, A.; Spinka, H. M.] Argonne Natl Lab, Argonne, IL 60439 USA.;[Jones, P. G.; Elhalhuli, E.; Burton, T. P.; Barnby, L. S.] Univ Birmingham, Birmingham, W Midlands, England.;[Ullrich, T.; Pile, P.; Lamont, M. A. C.; LeVine, M. J.; Ljubicic, T.; Hallman, T. J.; Xu, Z.; Ogawa, A.; Ruan, L.; Tang, A. H.; Videbaek, F.; Fine, V.; Fisyak, Y.; Beavis, D. R.; Lauret, J.; Bland, L. C.; Okada, H.; Longacre, R. S.; Sorensen, P.; Christie, W.; Arkhipkin, D.; Debbe, R. R.; Lebedev, A.; Dunlop, J. C.; Perevoztchikov, V.; Gordon, A.; Landgraf, J. M.; DePhillips, M.; Love, W. A.; Yip, K.; Didenko, L.; Guryn, W.; Van Buren, G.; Fachini, P.; Lee, J. H.] Brookhaven Natl Lab, Upton, NY 11973 USA.;[Perkins, C.; Crawford, H. J.; Engelage, J.; Judd, E. G.] Univ Calif Berkeley, Berkeley, CA 94720 USA.
通讯机构：
[Abelev, B. I.] U;Univ Illinois, Chicago, IL 60607 USA.
作者机构：
[Wei, Li] Huazhong Normal Univ, Complex Sci Ctr, Wuhan 430079, Peoples R China.;[Wei, Li; Wang, Q. A.; Le Mehaute, A.] Inst Super Mat Mans, F-72000 Le Mans, France.
通讯机构：
[Wei, L ] ;Huazhong Normal Univ, Complex Sci Ctr, Wuhan 430079, Peoples R China.
作者机构：
[Gu Jiao; Cai Xu; Li Wei] Huazhong Normal Univ, Complex Sci Ctr, Wuhan 430079, Peoples R China.;[Li Wei] Max Planck Inst Math Sci, D-04103 Leipzig, Germany.;[Gu Jiao; Cai Xu; Li Wei] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Li Wei] H;Huazhong Normal Univ, Complex Sci Ctr, Wuhan 430079, Peoples R China.
摘要：
We study message spreading on a scale-free network, by introducing a novel forget-remember mechanism. Message, a general term which can refer to email, news, rumor or disease, etc, can be forgotten and remembered by its holder. The way the message is forgotten and remembered is governed by the forget and remember function, F and R, respectively. Both F and R are functions of history time t concerning individual's previous states, namely being active (with message) or inactive (without message). Our systematic simulations show at the low transmission rate whether or not the spreading can be efficient is primarily determined by the corresponding parameters for F and R.
作者机构：
[Li, Wei; Liu, Feng; Xu, Xin-Ping] Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Xu, Xin-Ping] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.;[Li, Wei] Max Planck Inst Math Sci, Leipzig, Germany.
通讯机构：
[Xu, Xin-Ping] H;Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
We study the coherent exciton transport on Apollonian networks generated by simple iterative rules. The coherent exciton dynamics is modeled by continuous-time quantum walks and we calculate the transition probabilities between two nodes of the networks. We find that the transport depends on the initial nodes of the excitation. For networks up to the second generation the coherent transport shows perfect recurrences when the initial excitation starts at the central node. For networks of higher generation, the transport only shows partial revivals. Moreover, we find that the excitation is most likely to be found at the initial nodes while the coherent transport to other nodes has a very low probability. In the long time limit, the transition probabilities show characteristic patterns with identical values of limiting probabilities. Finally, the dynamics of quantum transport are compared with the classical transport modeled by continuous-time random walks.
通讯机构：
[Li, W.] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
scaling law;transportation network;complex system
摘要：
We present a detailed, empirical analysis of the statistical properties of the China Railway Network (CRN) consisting of 3915 nodes (train stations) and 22 259 edges (railways). Based on this, CRN displays two explicit features already observed in numerous real-world and artificial networks. One feature, the small-world property, has the fingerprint of a small characteristic shortest-path length, 3.5, accompanied by a high degree of clustering, 0.835. Another feature is characterized by the scale-free distributions of both degrees and weighted degrees, namely strengths. Correlations between strength and degree, degree and degree, and clustering coefficient and degree have been studied and the forms of such behaviors have been identified. In addition, we investigate distributions of clustering coefficients, topological distances, and spatial distances.
作者：
Li, W.*;Wang, Q. A.;Nivanen, L.;Le Mehaute, A.
期刊：
Physica A: Statistical Mechanics and its Applications,2006年368(1):262-272 ISSN：0378-4371
通讯作者：
Li, W.
作者机构：
Inst Super Mat Mans, F-72000 Le Mans, France.;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Li, W.] Inst Super Mat Mans, 44 Ave FA Bartholdi, F-72000 Le Mans, France.
通讯机构：
[Li, W.] I;Inst Super Mat Mans, 44 Ave FA Bartholdi, F-72000 Le Mans, France.
作者机构：
[Xu, XP] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Max Planck Inst Math Sci, D-04103 Leipzig, Germany.
通讯机构：
[Xu, XP] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
Growing Small-World Networks;Modified BA Model
摘要：
We modify the （Barabgsi-Albert） BA model for the evolution of small-world networks. It is introduced as a modified BA model in which all the edges connected to the new node are made locally to the old node and its nearest neighbours. It is found that this model can produce small-world networks with power-law degree distributions. Properties of our model, including the degree distribution, clustering, average path length and degree correlation coefficient are compared with that of the BA model. Since most real networks are both scalefree and small-world networks, our model may provide a satisfactory description for empirical characteristics of real networks.
作者机构：
[李炜; M．Zapotocky] 华中师范大学物理科学与技术学院;[李炜; M．Zapotocky] Max-Planck-Institute for the Physics of Complex Systems,Noethnitzer Str．38,01187,Dresden,Germany
期刊：
International Journal of Modern Physics E,2006年15(4):865-876 ISSN：0218-3013
通讯作者：
Li, Wang
作者机构：
[Li, Wang] Nan Yang Normal Univ, Dept Phys, Henan 473061, Peoples R China.;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Li, Wang] N;Nan Yang Normal Univ, Dept Phys, Henan 473061, Peoples R China.
摘要：
Recent observation of high-pT hadron spectra suppression and mono-jet production in central Au-Au collisions and Cu-Cu collisions at RHIC have confirmed the long predicted phenomenon of jet quenching in high-energy-ion collisions. Detailed analyses of the experimental data show parton energy loss as the mechanism for the discovered jet quenching. Preconception-free analyses of the inclusive invariant transverse-momentum distribution data taken from the measurements of Au-Au collisions at and have been performed. It is observed that the distribution exhibits for pT≥2 GeV/c remarkably good power-law behavior (pT-scaling) with general regularities. It may explain the data coming from the STAR or PHENIX to some extent. Using the power-law by a simple model, its underlying geometrical structure has to be understood in terms of fractal dimensions. A simple model is proposed which approximately reproduces the above-mentioned data for the phenomenon, and it affords a new way to research the QGP matter and jet quenching. Further heavy-ion collision experiments are suggested.
期刊：
European Physical Journal B,2005年48(1):95-100 ISSN：1434-6028
通讯作者：
Li, W
作者机构：
Inst Super Mat Mans, F-72000 Le Mans, France.;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Li, W] Inst Super Mat Mans, 44 Ave FA Bartholdi, F-72000 Le Mans, France.
通讯机构：
[Li, W] I;Inst Super Mat Mans, 44 Ave FA Bartholdi, F-72000 Le Mans, France.
关键词：
The European Physical Journal B;Condensed Matter;Complex Systems;journal;EPJ
摘要：
It is known that the nonextensive statistics was originally formulated for the systems composed of subsystems having same q. In this paper, the existence of composite system with different q subsystems is investigated by fitting the power law degree distribution of air networks with q-exponential distribution. Then a possible extension the nonextensive statistics to different q systems is provided on the basis of an entropy nonadditivity rule and an unnormalized expectation of energy.
期刊：
HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION,2004年28(1):1-10 ISSN：0254-3052
通讯作者：
Bai, JZ
作者机构：
[Bai, JZ] CAS, Inst High Energy Phys, Beijing 100039, Peoples R China.;Univ Sci & Technol China, Dept Modern Phys, Hefei 230027, Peoples R China.;Shandong Univ, Dept Phys, Jinan 250100, Peoples R China.;Zhejiang Univ, Dept Phys, Hangzhou 310028, Peoples R China.;Shanghai Jiao Tong Univ, Dept Appl Phys, Shanghai 200030, Peoples R China.
通讯机构：
[Bai, JZ] C;CAS, Inst High Energy Phys, Beijing 100039, Peoples R China.
关键词：
BES;BEPC;D-0 meson;branching fraction
摘要：
We report the results of an experimental study of the exclusive hadronic decays for D-0 --> K(s)(0)pi(+) pi(-) and (KsK+K-)-K-0 and their resonant structures using BES-I detector at the BEPC Collider. Using the data sample of 22.3 pb(-1) collected at the center-of-mass energy roots = 4.03 GeV, we measured the branching fraction for D-0 --> (K) over bar (0) pi(+) pi(-) to be (5.32 +/- 0.53 +/- 0.40)%, the branching fractions for the decays D-0 --> K* - pi(+), D-0 --> and D-0 --> (K) over bar (0) (pi(+) pi(-))(non-resonant) to be (6.05 +/- 0.32 +/- 0.49)%, (1.17 +/- 0.17 +/- 0.13)% and (1.35 +/- 0.22 +/- 0.17)% respectively. We measured the branching fractions Br(D-0 --> f) to be (1.04 +/- 0.24 +/- 0.16)% for f = (K) over bar (0) K+ K-, (1.12 +/- 0.34 +/- 0.15)% for f = (K) over bar (0)phi and (0.27 +/- 0.13 +/- 0.03)% for f = (K) over bar (0) (K+ K-)(non-phi).
作者机构：
[Li, W] Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Max Planck Inst Math Sci, D-04103 Leipzig, Germany.
通讯机构：
[Li, W] H;Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
Through the study of airport network of China (ANC), composed of 128 airports (nodes) and 1165 flights (edges), we show the topological structure of ANC conveys two characteristics of small worlds, a short average path length (2.067) and a high degree of clustering (0.733). The cumulative degree distributions of both directed and undirected ANC obey two-regime power laws with different exponents, i.e., the so-called double Pareto law. In-degrees and out-degrees of each airport have positive correlations, whereas the undirected degrees of adjacent airports have significant linear anticorrelations. It is demonstrated both weekly and daily cumulative distributions of flight weights (frequencies) of ANC have power-law tails. Besides, the weight of any given flight is proportional to the degrees of both airports at the two ends of that flight. It is also shown the diameter of each subcluster (consisting of an airport and all those airports to which it is linked) is inversely proportional to its density of connectivity. Efficiency of ANC and of its subclusters is measured through a simple definition. In terms of that, the efficiency of ANC’s subclusters increases as the density of connectivity does. ANC is found to have an efficiency of 0.484.
作者机构：
[Chi, LP] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Huazhong Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.;Max Planck Inst Math Sci, D-04103 Leipzig, Germany.
通讯机构：
[Chi, LP] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
拓扑结构;飞行网络;聚类系数;网络结构;航程;飞机飞行
摘要：
We analyse the directed, weighted and evolutionary US flight network, in which vertices are the airports and the flights connecting two airports represent the edges. It is shown that such a network displays two important features recently found in small-world networks. First, the average shortest-path length is 2.4 s, the clustering coefficient of the entire network, 0.618, is greatly larger than that of the random networks with the same N (system size) and <k> (average degree), 0.065. We study the detailed flight information both in a week and on a whole. In both the cases, using the Pareto distributions, we find the degree distributions follow two-segment power laws. The weight distributions have power-law tails with the exponents of around 2, and the clustering coefficient distributions follow linear distributions.